Hoisting apparatus.



No. 820,764. PATENTED MAY 15, 1906. W. H. BROWN.

HOISTING APPARATUS.

APPLICATION FILED MAR. 2, 190a.

UNITED STATES PATENT orinon WILLIAM H. BROWN, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO ENERGY ELEVATOR COMPANY, OF PHILADELPHIA,PENNSYLVANIA, ACORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

Patented May 15, 1906.

Application filed March 2, 1906. Serial N0. 303.782-

To all whom it may concern.-

Be it known that I, WILLIAM H' BROWN, a citizen of the United States,residing at the city of Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented certain new and useful Improvementsin Hoisting Apparatus, of which the following is a specification.

My invention has relation to a hoisting apparatus especially adapted fordumb-waiters in which the weight of the load to be lowered, as Well asthe upward movement of the load elevated, is utilized to actuate a braketo hold the same in any given position; and in such connection itrelates particularly to the constructive arrangement of the brake andhoisting mechanisms of the apparatus.

The principal objects of my invention are, first, to prevent a bindingof the load-wheel on its supporting-shaft by rigidly securing the sameto the shaft of the hoisting apparatus and by separating the load-Wheelfrom the mechanism controlling the rotation of the wheel and shaft;second, to so arrange the operating wheel of the hoisting apparatusloosely mounted on the shaft as to control the actuation of brake-arms,which automatically stop rotation of the load-wheel third, to providethe shaft with a disk actuated by the same which controls the brake-armswhen the weight of the descending load or of an ascending load actuatesthe shaft, and, fourth, to provide the hoisting apparatus with astationary ring or annulus and to surround the same by the brake-arms,which when alternately controlled by the intervention of theoperating-wheel and of the load-wheel are brought into and out ofengagement with said ring or annulus to permit of the descent or of theascent of the dumb-waiter by the load-wheel. l

The nature and scope of my present invention will be more fullyunderstood from the following description, taken in connectipn with theaccom anying drawings, forming part hereof, in w ich-- Figure 1 is aview illustrating, partly in ele .vation and part1 in section, ahoisting apparatus and also s owing the manner of controlling brake-armsby an operating-wheel mounted loosely on the shaft of the apparatus andby a disk fixed to the shaft controlled by the load-wheel rigidlysecured thereto, all

embodyin main features of my said invention; and ig. 2 is across-sectional view on the line at it of Fig. 1.

Referring to the drawings, (t represents a shaft, which is supported atone end by a bearing a and at its other end by the hub extension I) ofan operating-wheel b, which extension in turn is supported by abearing aThe bearings a/ and a are supported by the beams a of a structure (notshown) in which the dumb-waiter and a counterweight for the same aremoved upward and downward and are connected with each other by a rope(not shown) which passes over a load-wheel c, rigidly secured to theshaft (1. This rope by its movements rotates the load-wheel c and shafta. The dumb-waiter (not shown) being normally loaded, and thusovercoming the action of the counterweight, (not shown,) tends to rotatethe load-wheel c and by the same the shaft a in the direction indicatedby the arrow in Fig. 1. This movement of the shaft (1 by means of a diskd, rigidly secured thereto, serves to actuate a brake-lever f by theintervention of a belt at connected with a disk d. This lever f by beinglifted at its free end brings two brake arms g and g, pivotallyconnected in the points 9 and g to the other end of the same, inengagement with a ring or annulus 7t, preferably formed integral withthe lower portion of the bearing a and connected therewith by extensionsh to stop the rotation of the shaft or and load-wheel c and to preventthe dumb-waiter from falling.

As shown in full and dotted lines in Fig. 2, the brake-arms g and g atone end, by means of a bolt 4/, are directly connected with a holder orplate i, loosely mounted on the shaft a and preferably of diamond shapein outline, while at their other end the arms 9 and g are connected tothe holder i by the intervention of the brake-lever f, which ispivotally secured thereto by a bolt i arranged intermediate of thepivotal points g and g of the brake-arms g and 9. Thus when thebrake-lever f is raised at its free end in Fig. 2 by the bolt d, thesame swinging witn its other end on the bolt i supported by the holderi, will draw the brake-arm g and g toward each other and bring the sameinto engagement with the stationary ring it and clamp the brake armsthereto, by which clamping the further rotation of the shaft a andload-wheel c is automatically stopped. In order to permit of a furtherrotation of the load-wheel c in the direction of the arrow indicated inFig. 1 and descent of the dumbwaiter, the brake-arms g and g must firstbe brought out of engagement with the ring h, which is accomplished bythe following preferred mechanism: The hub extension 1) of theoperating-wheel b "is provided with a flange b between which and thedisk (Z the brake-lever f is located.

When the operating-wheel b is rotated in the same direction as theloadwheel c by means of a rope passing over the same, its movement istransmitted to the flange 11 which by means of a bolt 6 depresses thefree end of the brake-leverf, and thus releases the brake-arms g and gfrom the ring h, by which release the shaft a and load-wheel 0 willagain be permitted to rotate in the direction indicated by the arrow.If, however, it becomes necessary to rotate the shaft a and loadwheel 0in a direction opposite to that indicated by the arrow, so as to raisethe dumbwaiter, (not shown,) this is accomplished by turning theoperating-wheel b in the same direction-that is, opposite to thatindicated by the arrowby which movement the bolt 1) of the flange b isbrought into engagement with the brake-lever f, which by being depressedis brought into engagement with the bolts d and d of the disk cl,secured to the shaft a.

By the depressing of the brake-lever f the brake-arms g and g arebrought out of engagement with the ring 7L, and at the same time thelever f by being brought into engagement with the bolts cl and (1 permitthe operating-wheel b by the intervention of the disk (1 to rotate theshaft a and load-Wheel c, and thus to raise the dumb-waiter. As soon,however, as the operating-wheel b is not positively actuated the weightof the dumbwaiter rotating tne shaft a will cause an instant applicationof the brake-arms g and g to the ring h by raising the brake-lever f.Thus the load-wheel c and shaft a will be rotated as long as theoperating-wheelv b is positively actuated by an attendant either toraise or to lower the dumbwaiter, which tends to rotate the same in thedirection indicated by the arrow.

If it is desired to normally rotate the shaft a and load-wheel c in anopposite direction to that indicated. by the arrow by using acounterweight which is heavier than the dumbwaiter to permit the same toraise the waiter and overcome the weight of articles placed thereon, thebrake-leverf in this instance is raised by the bolt d of the disk (Z, bywhich movement the brake-arms g and g will be brought into engagementwith the ring it. Thus the ascent of the waiter is stopped until theleverf is again depressed by tne bolt 1) of the flange b of theoperating-wheel b.

By using a heavier counterweight the attendant is relieved from raisingthe load carried by the dumb-waiter, which in this manner is liftedwithout exertion on the part of the attendant. This feature of thehoisting apparatus hereinbefore described is valuable in that it permitsthe attendant to rotate the operating-wheel b in the direction indicatedby the arrow when the dumb-waiter is to be lowered, which movement ofthe rope actuating the operating-wheel I) being in a downward directionrequires, as is well known, a far less exertion on the part of theoperator. A collarlc, secured to the shaft a, tends to hold theoperating-wheel b and its flange b in proper position with respect tothe ring it, while a collar Z, secured to the shaft (2 and bearingagainst the holder i for the brakearms 9 and g, serves to hold the sameand the lever f in proper position with respect to the ring h, disk (1,and flange b of the wheel 6.

Instead of employing the hoisting'apparatus for raising and loweringdumb-waiters, as hereinbefore described, it may be used with equallygood results in raising and lowing any other type or kind of load orweight and of holding the same in any given position required.

Having thus described the nature and objects of my invention, What Iclaim as new, and desire to secure by Letters Patent, is-

1. A hoisting apparatus, comprising a shaft, a stationary ringsurrounding said shaft, brake-arms surrounding said ring, a leverpivotally connected with said brakearms, a load-wheel and a disk rigidlysecured to said shaft, said disk arranged to actuate said lever and bythe same bring said brakearms into engagement with said ring to hold theload from either falling or rising when the same tends to rotate saidshaft.

2. A hoisting apparatus, comprising a shaft, a stationary ringsurrounding said shaft, brake-arms surrounding said ring, a leverpivotally connected with said brakearms, a load-wheel and a disk rigidlysecured to said shaft, and an operating-wheel loosely mounted on saidshaft, said disk arranged to actuate said lever so as to bring saidbrakearms into engagement with said ring to hold the load from eitherfalling or rising when the same tends to rotate said shaft and saidoperating-wheel arranged to release said brakearms from said ring bymoving said lever in a direction opposite to that imparted to the sameby said disk.

3. A hoisting apparatus, comprising a shaft, a stationaryringsurrounding the same, brake-arms surrounding said ring, a loadwheel anda disk rigidly secured to said shaft, an operating-wheel loosely mountedon said shaft, a lever pivotally connected with said brake-arms andinterposed between said disk and o erating-wheel, said lever arranged tobe independently actuated by said disk and operating-wheel so as tobring said brakearnis into and out of engagement with said ring.

4. A hoisting apparatus, comprising a shaft, a stationary ringsurrounding the same, brake-arrns surrounding said ring, a loadwheel anda disk ri idly secured to said shaft, said disk having bolts, anoperating-wheel having a flanged extension loosely mounted on saidshaft, bolts, carried by said extension, a lever pivotally connectedwith said brakearms and interposed between the bolts of said flangedextension and disk, said lever arranged to be independently andalternately actuated by the bolts of said disk and the flanged extensionof said operating-wheel to bring said brake-arms into and out ofengagement with said ring.

5 A hoisting apparatus comprising a shaft, a stationary ring surroundingthe same, brake-arms surrounding said ring, a loadwheel and a diskrigidly secured to said shaft,

said disk having bolts, an operating-wheel having a flanged extensionloosely mounted on said shaft, bolts carried by said extension, a leverpivotally connected with said brakearms and interposed between the boltsof said flanged extension and disk, said lever arranged to beindependently and alternately actuated by the bolts of said disk and theflanged extension of said operating-wheel to bring said brake-arms intoand out of engagement with said ring and means loosely mounted on saidshaft and adapted to support said brake-arms and lever.

In witness whereof I have hereunto set my signature in the presence oftwo subscribing Witnesses.

WM. H. BROWN. Witnesses:

J. WALTER DOUGLASS, THoMAsM. SMITH.

